CN105830362A - Method and apparatus for wireless communication of machine type communication - Google Patents

Abstract

The invention provides a method and an apparatus for wireless communication of machine type communication. A method and an apparatus for wireless communication in case of MTC are provided. The method comprises receiving a signal, wherein a control signal is received on a downlink control channel based on limited reception capacity of the UE and transmitting signals on an uplink channel based on the received signal via the downlink channel.

Description

Method and apparatus for the radio communication of machine type communication

Technical field

The application relates to radio communication, relates more specifically to machine type communication (MTC) equipment with limited capability.

Background technology

Third generation partner program (3GPP) Long Term Evolution (LTE) is UMTS (UMTS) and the modified version of 3GPP version 8.3GPPLTE uses OFDM (OFDMA) at downlink, and uses single-carrier frequency division multiple access (SC-FDMA) in up-link.3GPPLTE uses the multiple-input and multiple-output (MIMO) with up to four antennas.In recent years, the 3GPPLTE-advanced (LTE-A) of the evolution as 3GPPLTE is discussed.

The commercialization of 3GPPLTE (A) system is the most accelerated.Along with in response to can guarantee the demand of the ambulant user supporting more high-quality and the service of higher-capability and voice service simultaneously, extend LTE system more quickly.LTE system provides low transmission delay, high transfer rate and system capability and the covering of enhancing.

In LTE-A of future generation, it is considered to the data communication configurations mainly for the stock control etc. such as read ammeter, measure water level, supervision, automatic vending machine uses low cost and/or the system of low specification (low performance) terminal.Describing for convenience, this terminal can be referred to as machine type communication (MTC) equipment (MTC terminal).

Use about MTC device, owing to the amount of data that sent in the case of using the communication of MTC device can be the least and may occasionally there are the transmission of uplink/downlink data, so it is effective for using the MTC device with low price and low battery loss.

Summary of the invention

Technical problem

The method and apparatus that it is an object of the present invention to provide the radio communication of MTC for having limited covering.

It is a further object to provide for receiving with limited covering and/or sending unicast data and the method and apparatus of broadcast data.

It is a further object to provide the method and apparatus for determining the effective PRB in the PRB distributed by the UE with limited covering.

Technical scheme

Embodiments of the present invention are for via the method receiving the radio communication covering limited subscriber equipment (UE).The method includes: receiving signal, wherein, reception based on UE covers and receives control signal on the downlink control channels；And send signal on the uplink channel based on the signal received via downlink channel.Here, the subframe receiving unicast data and the subframe receiving broadcast data can be different.Or, when sending unicast data and broadcast data at same subframe, unicast data can be received with the priority higher than broadcast data.It addition, when the Resource Block distributed based on control signal monitoring, the Resource Block distributed can be determined that effectively.

Another embodiment of the invention is for receiving the device covering limited radio communication.This device includes radio frequency (RF) unit, and it is used for sending and receiving wireless signal；And processor, it is operably coupled to RF unit, and wherein, processor is configured to send signal based on the scheduling for UL and/or DL via RF unit, and wherein, processor receives control signal on the downlink control channels based on receiving to cover.Here, the subframe receiving unicast data and the subframe receiving broadcast data can be different.Or, when sending unicast data and broadcast data at same subframe, unicast data can be received with the priority higher than broadcast data.It addition, when the Resource Block distributed based on control signal monitoring, the Resource Block distributed can be determined that effectively.

Beneficial effect

According to the present invention, UE can utilize limited covering effectively to communicate.

According to the present invention, the UE with limited covering can receive unicast data with broadcast data in the case of not conflicting.

According to the present invention, the UE with limited covering can utilize the effective PRB in distributed PRB to operate.

Accompanying drawing explanation

Fig. 1 shows the wireless communication system of the application present invention.

Fig. 2 shows the concept of carrier aggregation (CA) technology according to an illustrative embodiment of the invention.

Fig. 3 shows the structure of the radio frames of the application present invention.

Fig. 4 shows the downlink control channel of the application present invention.

Fig. 5 schematically illustrates and only counts coupling PRB.

Fig. 6 is the flow chart of the operation of the UE briefly describing the invention according to the disclosure.

Fig. 7 is the block diagram briefly describing the wireless communication system including UE and BS (eNB).

Detailed description of the invention

Fig. 1 shows the wireless communication system of the application present invention.Wireless communication system can also be referred to as UMTS Terrestrial radio access network (E-UTRAN) or Long Term Evolution (the LTE)/lte-a system of evolution.

E-UTRAN includes providing to subscriber equipment (UE) 10 controlling plane and at least one base station (BS) 20 of user plane.UE10 can be fixing or movement, and can be referred to as the another kind of term of such as movement station (MS), user terminal (UT), subscriber station (SS), mobile terminal (MT), wireless device etc..BS20 generally fixed station, this fixed station communicates with UE10, and BS20 can be referred to as the another kind of term of such as enode b (eNB), base transceiver systems (BTS), access point, community, node B or node etc..

The Multiple Access scheme being applied to wireless communication system is not limited.That is, various Multiple Access scheme, such as CDMA (CDMA), TDMA (time division multiple acess), FDMA (frequency division multiple access), OFDMA (OFDM), SC-FDMA (single carrier-FDMA), OFDM-FDMA, OFDM-TDMA, OFDM-CDMA etc. can be used.For ul transmissions and downlink transmission, TDD (time division duplex) scheme or FDD (FDD) scheme can be used, in TDD scheme, by using different time to be transmitted, in FDD scheme, by using different frequency to be transmitted.

BS20 can interconnect by means of X2 interface.BS20 is connected to evolution block core net (EPC) 30 also by way of S1 interface, more specifically, be connected to Mobility Management Entity (MME) by S1-MME and be connected to gateway (S-GW) by S1-U.

EPC30 includes MME, S-GW and grouped data network gateway (P-GW).MME has the access information of UE or the ability information of UE, and this information is generally used for the mobile management of UE.S-GW is the gateway having E-UTRAN as end points.P-GW is the gateway having PDN as end points.

Can based on Open System Interconnection (OSI) model known in communication system lower three layers multiple layers of the radio interface protocol between UE and network are divided into ground floor (L1), the second layer (L2) and third layer (L3).Among these layers, physics (PHY) layer belonging to ground floor services by using physical channel to provide information to transmit, and belongs to wireless heterogeneous networks (RRC) layer of third layer for the Radio Resource controlling between UE and network.To this end, rrc layer exchanges RRC information between UE and BS.

In more detail, explain for user plane (U plane) and the radio protocol architecture of control plane (C plane).Upper strata is provided information transmission to service by physical channel by PHY layer.PHY layer is connected to the medium access control on the upper strata into PHY layer (MAC) layer by transmission channel.Between MAC layer and PHY layer, data are transmitted by transmission channel.According to how transmitting data by wave point and transmission has the defeated channel of data mutual transmission of how characteristic and classifies.Between different physical layer (that is, the physical layer of transmitter and the physical layer of receptor), pass through physical channel transfers data.Physical channel can use OFDM (OFDM) scheme to be modulated, and time and frequency can be utilized as Radio Resource.

The function of MAC layer includes: map between logic channel and transmission channel；And the transmission block that the transmission channel of the MAC Service Data Unit (SDU) by belonging to logic channel is supplied to physical channel carries out multiplex/demultiplex.MAC layer provides service by logic channel to wireless spread-spectrum technology (RLC) layer.

The function of rlc layer includes RLCSDU cascade, Segmentation and Reassembly.In order to ensure the various service quality (QoS) required for radio bearer (RB), rlc layer provides three kinds of operator schemes (that is, transparent mode (TM), Unacknowledged Mode (UM) and affirmation mode (AM)).AMRLC provides error correction by using HARQ (ARQ).

The function of packet data convergence protocol (PDCP) layer in user plane includes user data payment, header-compressed and encryption.The function controlling the PDCP layer in plane includes that controlling panel data pays and encryption/integrity protection.

Define Radio Resource (RRC) key-course the most in the control plane.The configuration of rrc layer and radio bearer (RB), reconfigure and release is associated for controlling logic channel, transmission channel and physical channel.RB is the logical path paid for the data between UE and network provided by ground floor (that is, PHY layer) and the second layer (that is, MAC layer, rlc layer and PDCP layer).

The setting of RB means for specifying radio protocol layer and the characteristic of channel to provide the process of special services and for determining the process of respective detail parameters and operation.RB can be divided into two types, i.e. signaling RB (SRB) and data RB (DRB).SRB is used as in the path controlling planar transmission RRC information.DRB is used as the path at user-plane transmissions user data.

Setting up RRC between at the rrc layer and the rrc layer of network of UE when being connected, UE is in RRC connection status (also referred to as RRC connection mode), and otherwise, UE is in RRC idle condition (also referred to as RRC idle pulley).

Fig. 2 shows the concept of carrier aggregation (CA) technology according to an illustrative embodiment of the invention.

With reference to Fig. 2, show and be polymerized multiple CC (in this example, there are 3 carrier waves) 3GPPLTE-A (LTE-Advanced) system in downlink (DL)/up-link (UL) subframe structure of considering, UE can be simultaneously from multiple DLCC monitoring with receive DL signal/data.But, even if community is just managing N number of DLCC, network can also give cell configuration M DLCC, wherein, M≤N so that the monitoring of the UE of DL signal/data is limited to this M DLCC.It addition, network can configure L DLCC as main DLCC, UE should specifically or community specifically monitors/receives and has the DL signal/data of priority from these main DLCC or UE, wherein, L≤M≤N.Therefore, UE can support one or more carrier wave (carrier wave 1 or more carrier wave 2...N) according to the ability of its UE.

Depending on component or whether community is activated, component or community can be divided into principal component carrier wave and auxiliary component carrier.PCC is always activated, and SCC is activated according to specified conditions or deexcitation.Among multiple Serving cells, the resource of connection (or RRC connect) is initially set up it is to say, PCell (main Serving cell) is UE.The PCell connection (or RRC connects) of the signaling acted on relative to multiple communities (CC), and be the special CC for the UE context that management is the link information relating to UE.Additionally, when PCell (PCC) and UE sets up and is connected and is thus in RRC connection mode, PCC always exists in state of activation.SCell (auxiliary serving cell) is assigned to the resource of UE outside being in addition to PCell (PCC).SCell is in addition to the extension carrier wave outside PCC for additional resource distribution etc., and can be divided into state of activation and deactivation status.SCell is most initially in deactivation status.If SCell is deactivated, then this SCell includes: do not sends detection reference signal (SRS) on SCell, report transmission on CQI/PMI/RI/PTI, the not UL-SCH on SCell, the PDCCH not monitored on SCell for SCell, do not monitor PDCCH for SCell.UE is activating or is receiving activation/deactivation MAC control element in this TTI of deexcitation SCell.

In order to increase user throughput, it is also considered that allowing more than resource polymerization between the node of an eNB/ node, wherein, UE can be configured with more than a carrier wave set.Especially, the PCell of every carrier wave set can not be deactivated.In other words, once the PCell of this every carrier wave set is configured to UE, then the PCell of each carrier wave set every can keep its state to activate always.In this case, with do not include that corresponding for the PCell Serving cell index i indexing in the carrier wave set of 0 as the Serving cell of main PCell is consequently not used for activation/deactivation.

More specifically, if under the situation of two carrier wave set of the PCell that Serving cell index 0 is PCell and Serving cell index 3 is the second carrier wave set, Serving cell index 0,1,2 is configured by a carrier wave set, and Serving cell index 3,4,5 is configured by another carrier wave set, then for first carrier group community activation/deactivation message, only bit corresponding to 1 and 2 is assumed to be effectively, and for the second carrier wave set community activation/deactivation corresponding to 4 and 5 bit be assumed to be effectively.In order to make some differences between the PCell of the PCell of first carrier group and the second carrier wave set, hereinafter the PCell of the second carrier wave set can be referred to as S-PCell.Here, the index of Serving cell can be the logic index determined relative to each UE, or could be for indicating the physics index of the community of special frequency band.CA system supports non-across carrier dispatching or across carrier dispatching from carrier dispatching.

Fig. 3 shows the structure of the radio frames of the application present invention.

With reference to Fig. 3, radio frames includes that 10 subframes, a subframe include two time slots.The time sending a subframe cost is referred to as Transmission Time Interval (TTI).Such as, the length of a subframe can be 1ms, and the length of a time slot can be 0.5ms.

One time slot includes multiple OFDM symbol in time domain, includes multiple Resource Block (RB) in frequency domain.OFDM symbol is intended to indicate that a symbol period, because downlink OFDMA is used in 3GPPLTE, and it can be referred to as SC-FDMA symbol or depend on the symbol period of multiple access scheme.RB is resource allocation unit, and RB includes multiple continuous print subcarrier in one time slot.The quantity of the OFDM symbol that one time slot includes may rely on the configuration of CP (Cyclic Prefix) and changes.CP includes extending CP and normal CP.Such as, if in normal CP situation, then OFDM symbol is formed by 7.If configured by extension CP, include 6 OFDM symbol the most in one time slot.If channel status be unstable (such as, with the UE of fast step-movement, the then CP extended may be configured to reduce intersymbol interference.Here, the structure of radio frames is only used to illustrate, and the quantity of OFDM symbol that the quantity of time slot that includes of the quantity of subframe that includes of radio frames or subframe and time slot include can change, in a different manner to apply new communication system.The invention is not restricted to be suitable to other system by change special characteristic, and embodiments of the present invention can be applied in corresponding system in a variable manner.

Downlink time slots includes multiple OFDM symbol in the time domain.Such as, a downlink time slots is shown as including 7 OFDMA symbol, and a Resource Block (RB) is shown as including 12 subcarriers in a frequency domain, but is not limited to this.Each element on resource grid is referred to as resource element (RE).One Resource Block includes 12 × 7 (or 6) individual RE.Quantity N of the Resource Block that downlink time slots includes^DLDepend on the downlink transmission bandwidth arranged in community.Band a width of 1.4MHz, 3MHz, 5MHz, 10MHz, 15MHz and the 20MHz considered in LTE.If being represented bandwidth by the quantity of Resource Block, then they are respectively 6,15,25,50,75 and 100.

Front portion 0 or 1 or 2 or 3 OFDM symbol of the first time slot in subframe are corresponding with the control area that control channel is assigned, and its remaining OFDM symbol becomes the data area that Physical Downlink Shared Channel (PDSCH) is assigned.The example of down control channel includes physical control format indicator channel (PCFICH), Physical Downlink Control Channel (PDCCH) and Physical Hybrid ARQ Indicator channel (PHICH).

PCFICH carrying control format designator (CFI) sent in the first OFDM symbol of subframe, this CFI is about being used in subframe controlling the quantity of the OFDM symbol of the transmission of channel (i.e., the size of control area), that is, carrying is about being used for controlling the information of the quantity of the OFDM symbol of the transmission of channel in subframe.First UE receives CFI on PCFICH, and monitors PDCCH afterwards.

PHICH carrying is in response to confirmation (ACK)/non-acknowledgement (NACK) signal of uplink hybrid automatic repeat request (HARQ).It is to say, send the ack/nack signal for the uplink data sent by UE on PHICH.

PDCCH (or ePDCCH) is downlink physical channel, PDCCH can carry the resource about downlink sharied signal channel (DL-SCH) and distribute and the information of transformat, the information distributed about the resource of uplink shared channel (UL-SCH), paging information about paging channel (PCH), system information on DL-SCH, about high-layer control message resource distribute information (such as, the accidental access response sent on PDSCH, one group of transmission power control order for the UE in a certain UE group, the activation etc. of IP phone (VoIP)).

Multiple PDCCH can be sent in control zone, and UE can monitor multiple PDCCH.Control to send on channel element or in the polymerization of some continuous CCE PDCCH at one.CCE is the logical allocation unit providing encoding rate for the state according to wireless channel to PDCCH.CCE corresponds to multiple resource element groups (REG).The incidence relation between quantity and the encoding rate of CCE offer according to CCE determines the form of PDCCH and the quantity of the bit of available PDCCH.

The wireless communication system of the present invention uses blind decoding for Physical Downlink Control Channel (PDCCH) detection.Blind decoding is that the CRC demasking from PDCCH goes out identifier expected to determine that whether PDCCH is the scheme controlling channel of oneself by performing crc error verification.ENB determines PDCCH form according to by the Downlink Control Information (DCI) being sent to UE.Hereafter, cyclic redundancy check (CRC) is attached to DCI by eNB, and unique identifier (being referred to as radio network temporary identifier (RNTI)) is sheltered CRC by the owner or purposes according to PDCCH.Such as, if PDCCH is for particular UE, then the unique identifier (such as, community-RNTI (C-RNTI)) of UE can be sheltered CRC.Alternatively, if PDCCH is for beep-page message, then paging indicator identifiers (such as, paging RNTI (P-RNTI)) can be sheltered CRC.If PDCCH is for system message (more specifically, system information block that will be described below (SIB)), then can be to CRC masking system information identifier and system information RNTI (SI-RNTI).In order to indicate the accidental access response as the response to the random access guiding sending UE, Stochastic accessing RNTI (RA-RNTI) can be sheltered CRC.

BS determines PDCCH form according to by the Downlink Control Information (DCI) being sent to UE, and cyclic redundancy check (CRC) (CRC) is attached to control information.DCI includes uplink scheduling information or downlink schedule information or up transmission (Tx) power control command for any UE group.Form according to DCI uses DCI distinctively, and DCI also has the different field defined in DCI.

Additionally, uplink sub-frames can be divided into: control area, the physical uplink control channel (PUCCH) of carrying uplink control information is assigned to this control area；Control information includes the ACK/NACK response of downlink transmission.Data area, in a frequency domain, the Physical Uplink Shared Channel (PUSCH) of carrying user data is assigned to this data area.

PUCCH can support multiple format.That is, PUCCH can send the uplink control information with every subframe difference amount of bits according to modulation scheme.PUCCH format 1 is used for sending dispatch request (SR), and PUCCH format 1a and 1b are used for sending HARQACK/NACK signal.PUCCH format 2 is used for sending channel quality instruction (CQI), and PUCCH format 2a and 2b are used for sending CQI and HARQACK/NACK.When HARQACK/NACK signal is individually sent, use PUCCH format 1a and 1b；When SR is individually sent, use PUCCH format 1.And PUCCH format 3 can be used for TDD system and FDD system.

Here, ePDCCH can be in the solution of the restriction of the PDCCH transmission of the communication system in the near future to the carrier wave including new type as shown in Figure 4 or the transmission of new control information.

Fig. 4 shows the downlink control channel of the application present invention.Multiple Scell of CA can be supported with the ePDCCH of PDSCH multiplexing.

The multiple PDCCH/ePDCCH in control area and/or data area can be monitored with reference to Fig. 4, UE.When sending EPDCCH in the specific search volume of UE, PDCCH in public search space and in the specific search volume of UE, can be sent.When sending PDCCH on CCE, can send ePDCCH on the eCCE (CCE of enhancing) of the polymerization as some continuous CCE, this eCCE corresponds to multiple REG.If ePDCCH is more more effective than PDCCH, then be worth having only use ePDCCH and without the subframe of PDCCH.Only PDCCH subframe and new ePDCCH subframe, or only have in the carrier wave of the new type that only ePDCCH subframe may be located at NC as having two traditional LTE subframes.It is still assumed that MBSFN sub-frame is present in new carrier wave NC.Can be via RRC signal deployment multimedia broadcasting Single Frequency Network (MBSFN) in NC if whether subframe using PDCCH and use will distribute how many OFDM symbol.Additionally, the TM10 of UE and new TM pattern can also be considered new carrier type.Hereinafter, new carrier type refers to can omit in a different manner or send the carrier wave of all or part of classical signal.Such as, new carrier wave can refer to can omit the specific public reference signal in community in some subframes or can not send the carrier wave of Physical Broadcast Channel (PBCH).

Additionally, in lte-a system of future generation, it is considered to use the system of the terminal (subscriber equipment) with low cost and low performance mainly for the data communication of the stock control etc. such as read ammeter, measure water level, supervision, automatic vending machine.Such terminal can be referred to as machine type communication (MTC) equipment (MTCUE).Use for MTC device, owing to the amount of data that sent in the case of using the communication of MTC device can be the least and may occasionally there are the transmission of uplink/downlink data, so keeping MTC device to have low price and low battery loss is effective.

For MTC, it can be assumed that MTCUE only receives data with the bandwidth more narrower than system bandwidth to reduce cost.Such as, when assuming that data receiver is available only for 6 Physical Resource Block (PRB), PRB can be configured in whole system bandwidth.For given configuration, need to consider when performing resource distribution by DCI the actual decoding of UE or interpretation resource allocation field and/or network how Resources allocation.

Hereinafter, resource for MTC is described in detail with reference to the drawings to distribute.

The signaling of PRB distribution

For the signaling of PRB distribution, it may be considered that whole following three kinds of methods: (1) predetermined configurations；(2) it is semi-statically configured；And (3) dynamically configure.

(1) predetermined configurations: using the method, UE can be preconfigured one group of PRB that UE should read.It is contemplated that system bandwidth and RBG determine PRB.

One example will select PRB with distribution mode as far as possible.Such as, in the system of 100 PRB, PRB#0, #99, #50, #75, #25, #49 and #87 can be selected.This may not consider that the distance between the formation of RBG, and the PRB selected by selection is distributed or the biggest PRB.

Select RBG the most in a distributed fashion, and then select a PRB from each selected RBG.Such as, in the system of 100 PRB, exist with such as 0 to 24 25 RBG being indexed.RBG can be selected in every 4 RBG.Therefore, such as, RBG#0, #4, #8, #12, #16, #20 can be selected, and a PRB can be selected (identical PRB can be selected (i.e. from each RBG from each RBG, first PRB from each RBG), or PRB can be randomly choosed from each RBG, or PRB selection can be according to Hopping Pattern (hoppingpattern)).

If using continuous resource distribution, then can select one group of RBG, wherein it is possible to select all PRB in these the selected RBG PRB of maximum allowable quantity (or up to).For example, it is possible to select RBG#0 and RBG#1 in the system of 100 PRB, wherein, front 6 PRB will be used for only reading the UE of 6 PRB.In other words, the selected RB for MTCUE can align with PRG and/or RBG distribution.

The another kind of method of this predetermined configurations is to make form, wherein, predefines one group of PRB according to bandwidth.One example will be table 1.

<table 1>

With reference to table 1, predetermined by selected PRB for each system bandwidth.

It addition, arrange for predetermined PRB, sending/receive (i.e., the individually transmission to each terminal) at least for clean culture, accidental access response (RAR) may be configured to clean culture and sends/receive the PRB of (hereinafter, " clean culture ").

Or, it is possible to specify form, wherein, each form entity comprises one group of PRB for clean culture, and UE can be based on cell-radio network temporary identifier (C-RNTI) or configured by high level and select a form.

Predetermined PRB can also have every subframe saltus step, and in other words, PRB index often can determine or change to subframe (or radio frames).This is to improve frequency diversity further.One example is to provide the specific Hopping Pattern in community (such as, 0,5,8,11,14,29,40,90,39,2,1) of every subframe, and wherein each PRB index changes according to the every subframe of this pattern.It is also contemplated that UE AD HOC.Can create based on community ID and predefine community AD HOC.For clean culture, it is also possible to consider UE AD HOC.

(2) it is semi-statically configured: if UE can be semi-statically configured one group of PRB, then can be limited to the PRB for unicast data, unless propagated this group PRB via PBCH or via across subframe scheduling, community public data can be scheduling.

This is in order to avoid following situation: UE is not successfully reconfigured the fuzzy of new group, but, network can consider successfully to reconfigure (or vice versa as the same).This is also otiose possibly for unicast data.Therefore, it is being configured without or is enabling in the case of subframe scheduling, may will not allow semi-static reconfiguring.

In order to avoid rollback operation, semi-static reconfiguring can also carry new PRB group and become the effective time.For example, it is possible to provide Single Frequency Network (SFN), wherein, the PRB group that (or enabling) is new will be used.Furthermore it is possible to send PRB group with signal by system information block (SIB) or Master Information Block (MIB) or alternate manner.

(3) dynamically configuration: merely with enabling across subframe scheduling or dynamic recognition can be realized.Or, it is assumed that UE has the ability of the limited PRB of monitoring, it is possible to use identical subframe scheduling.

When using dynamic recognition, UE assume that the downlink bandwidth for data receiver is identical with system bandwidth.In other words, it is not likely to be easily realization by the DCI size reduction of reduction down link data bandwidth.

The public PDSCH in community and clean culture PDSCH multiplexing

When UE can be configured with the one group of PRB being respectively used to the public PDSCH in community and clean culture PDSCH, there may be situations below: the public PDSCH in community and clean culture PDSCH can be sent in same subframe, and thus UE may must monitor the PRB being altogether more than 6.Owing to the ability of UE is limited, so the mechanism reducing monitoring PRB is necessary.According to different situations, community is public and priority between clean culture can as follows (i) different to (iv).

I () such as, is pre-configured with public for community and clean culture PRB.Should be shared by all low costs UE owing to community is public, and clean culture PRB can be frequency division multiplexed (in this application, can be referred to as " FDM-ed ") between UE, it is possible to be the public PRB different with unicast allocated in community.

Therefore, PRB group is likely to be different for every kind of situation.In this case, naturally enough considering time division multiplex (TDM) method, wherein, UE is configured with one group of subframe of UE monitoring community public data, and for another group (or, remain subframe), UE monitors its unicast data.

One simple example is that EPDCCH monitors sub-frame configuration, wherein, if UE is configured with EPDCCH and monitors subframe, then UE assume that the PRB public for community is monitored in non-EPDCCH monitoring subframe, and the PRB being used for clean culture is monitored in EPDCCH monitoring subframe.

This can be applied to across subframe scheduling and identical subframe scheduling.Such as, in subframe scheduling, when sending ePDCCH at the n-th subframe and at (n+i) individual subframe (i > 0, such as, i=1), when place sends the unicast data shown by the control data table of the such as DCI on ePDCCH, UE assume that and do not sends broadcast data or at least need not read broadcast data at (n+i) individual subframe.

In other words, UE undesirably can read unicast data and broadcast data in same subframe, and UE is it can be desirable to the gap that the subframe of clean culture is passed through to monitor between EPDCCH and EPDCCH and PDSCH of such as subframe group (such as, i) determines.In other subframe, UE is it can be desirable to broadcast data.But, if it should also be noted that use across subframe scheduling or if owing to the limited hardware capabilities of UE distributes to each PRB does not overlaps, then UE undesirably may receive at same subframe and control channel and data channel.In such a case, it is possible to only neither by the expectation broadcast data in the subframe not being configured to EPDCCH or control channel monitoring subframe that subframe scheduling is scheduling for unicast data.

Independent subset configuration is feasible.Before configuration or UE are in RRC_IDLE pattern, all subframes are assumed to be community common used monitor subframe so that the PRB that UE monitoring is public for community.

But, it should be noted that, if UE is scheduled as receiving unicast data in the subframe being configured to carry the potential subframe of community public data, then UE can read unicast data in the burst, i.e., if be scheduling UE via across subframe scheduling, the most scheduled PDSCH has higher priority regardless of subframe type or configuration.In other words, can have than predetermined PRB or the higher priority of PRB that is semi-statically configured via the instruction of dynamic signaling.

When configuring semi-persistent scheduling (SPS), no matter subframe type/configuration how, can monitor the PRB for SPSPDSCH.Or no matter its ability how, UE may need to support PRB and both PRB of clean culture configuration for the public configuration in community at any time.In this case, UE demand can increase.

(ii) such as, it is pre-configured with the PRB public for community, and dynamically instruction is used for the PRB of clean culture.In this case, clean culture PRB has the public higher priority than community.If there is the DCI of the different PRB group of instruction, then UE monitoring is used for the group behavior by default of the public PRB in community.This situation being applied to being semi-statically configured the PRB public for community.

The community public data of the monitoring subframe proposed in (i) and the separation of the unicast data of monitoring subframe can also be applied in this case.In other words, the technology mentioned in (i) and (ii) can be applied to including the different situation of (i) and/or (ii).

(iii) when community is public and both clean culture DCI can enter same subframe, the public DCI in community can have more higher priority than clean culture DCI.Therefore, for community, the resource distribution of public DCI has higher priority.

Therefore, UE assume that these PRB of public PDSCH are not effective for unicast data for community.Utilize this it is assumed that when counting the quantity of the PRB for unicast schedule, these PRB can not be counted as effective PRB.

Alternatively, UE assume that these PRB are rate-matched.Utilize this it is assumed that for the quantity of PRB, it follows the overlapping PRB between the PRB and the PRB being configured of DCI or scheduled, and then, UE may determine that these PRBs public for community do not carry clean culture PDSCH.

(iv), when determining during the subframe of (semi-statically or predetermined) carrying public PDSCH in community, UE should give community PRB priority more higher than clean culture PRB.If the sum of PRB or public for community or for clean culture, then UE may need to monitor more PRB (such as, for every kind of 6 PRB, the most totally 12 PRB).When existing overlapping between the two groups, UE may determine that the public PRB in community has more higher priority than clean culture PRB.

Therefore, when UE receives clean culture in these subframes for the public configuration in community, it should PRB public to Bu Yu community is overlapping, the PRB of the public PRB in Bu Wei community configuration counts.In other subframe, clean culture PRB has higher priority.

Noting, the invention proposed in the disclosure is applicable to have any situation of different scheduling mechanism (such as, self scheduling or identical subframe scheduling or across subframe scheduling).

Resource allocation field interprets

Once UE is configured with one group of PRB and monitors, it is necessary to define how resource distribution (RA) field configuring in RA in DCI and how to interpret RA field and therefore extract transport block size (TBS) and other.Except as otherwise noted, it is necessary to assume that will be { quantity of the PRB that the quantity of the PRB of scheduling, UE can monitor } in the two one of minimum for extracting the quantity of the RB of TBS.Generally speaking, it may be considered that two kinds of methods (A) and (B).

(A) RA is it shall be assumed that the downlink bandwidth being used for PDSCH is the PRB of the maximum quantity that UE can monitor.Such as, UE can monitor only 6 PRB, and the downlink bandwidth size for RA field will be " 6 " individual PRB rather than system bandwidth.

For resource distribution interpretation and TBS calculate, in this case, downlink bandwidth can be assumed to be " 6 ".Noting, here as example uses 6 PRB.The quantity of the actual PRB that UE can monitor can be the quantity of quantity, network configuration or the scene of every PDCCHOFDM symbol and different.For other quantity, the technology described in the present invention be applicatory and without loss of generality.

But, owing to physical resource can be discrete, it is possible to assume that RBG (RB group) is not used in the UE (i.e., it is impossible to enough UE received in whole system bandwidth) of the type.Or, at RBG by being use RBG in the case of the multiple PRB of continuous print forms in the PRB selected for low cost UE.In other words, RBG can be formed on potential discrete PRB.

If using this technology, TBS can be calculated as distributing to the quantity of the PRB of PDSCH.This is for creating the similar concept that minimum PRB index is mapped to the virtual PRB of virtual PRB index 0 (ascending order).But, owing to it may be shared, so this is consequently not used for community public data with the traditional UE reading whole system bandwidth.But, it is also feasible for separating community public for low cost UE.It can carry out signalisation (or whole system bandwidth or for the limited bandwidth of the public DCI in community) by the PBCH that will be used or other SIB.

Therefore, for community public data, the UE with limited downlink bandwidth monitoring capacity, some loss of datas caused owing to not monitoring the PRB of all scheduling can also be possible.In this case, the quantity of the PRB extracted for TBS can follow the quantity of the PRB of scheduling in scheduling.

(B) RA is it shall be assumed that the downlink bandwidth being used for PDSCH is identical with system bandwidth.In this example, such as, for community public data, even if UE can monitor limited group of PRB, resource distribution should also be as based on system bandwidth.Such as, for changing based on the dynamically monitoring PRB across subframe or identical subframe scheduling or DCI public for community will be necessary.

In this case, when using different resource allocation type, it is understood that there may be the situation of " mismatch " between DCI and the PRB group of UE monitoring.Such as, PRB#0, #4, #8, #12, #16, the #20 in the system bandwidth of UE 100 PRB of monitoring, and utilize resource allocation type 2 (resource indicated value, RIV) scheduling UE, the PRB dispatched by RIV can be not belonging to monitor PRB.Resource allocation type 2 can allow the distribution at frequency domain continuous print Resource Block.

In these cases, the process of such as (a), (b) and/or (c) will be necessary.

A () UE can skip these PRB and not count the quantity of these PRB, and only count the PRB of coupling.Therefore, the quantity of the PRB distributed by DCI and actual PRB quantity can be different.This can be applied to all resource allocation type.Therefore, for reliability, the single signaling of the quantity of the PRB of scheduling can dynamically be signaled.

Fig. 5 schematically illustrates and only counts coupling PRB.With reference to Fig. 5, the PRB among PRB, the PRB of monitoring dispatched by DCI is counted as effective PRB by UE.

B (), for across subframe or identical subframe scheduling, UE can arrange higher priority on DCI.Noting, this technology can be applied to across subframe scheduling or identical subframe scheduling and be applied to self scheduling or across carrier dispatching.

Substantially, the situation of UE ability is not mated in the resource distribution that this technology can be applied to dispatching for down link data bandwidth.Therefore, all PRB distributed by DCI should be assumed to be " effectively " PRB, and monitors these PRB.

If the quantity of the PRB distributed by DCI is beyond the maximum quantity of supported PRB, then UE can abandon the DCI as invalid DCI.Alternatively, due to the restriction of resource allocation type, if the more PRB of PRB that DCI distribution ratio UE can read, then the quantity of the PRB dispatched by DCI can be set to the maximum quantity (such as, 6) of the PRB that UE can read by UE.

For PRB, it should match with pre-configured or configuration monitoring PRB.If these PRB are disabled (such as, for across subframe), PRB can be selected to start until maximum can support that PRB counts from the minimum PRB of the PRB of distribution index.Such as, if scheduling #0, #4, #8, #12, #16, #20, #24, #32, the most front 6 (#0, #4, #8, #12, #16, #20) are assumed to be effective PRB (for example, it is also possible to application Else Rule, first the highest PRB index).

When applying this technology, UE can determine the quantity of RB of the distribution searched for TBS by actual quantity based on the PRB that UE has read.Such as, if DCI dispatches 8 PRB, wherein, UE has read only 6 PRB owing to its ability limits, then 6 PRB may be used for TBS calculating.

In the case of cannot assume that network knows the UE ability (such as, dispatch) in terms of limited data bandwidth for community public data as UE, UE can be owing to not reading to use under some performance impacts that PRB causes the quantity of the RB in scheduling DCI.

Additionally, first monitor relatively low PRB index the most first monitor the highest PRB index when selecting effective PRB, eNB can be by the DCI instruction direction (or from minimum or from the highest).

Additionally, when 2 code words using DCI2C type enable DCI, the second code word associated DC I field could be used to indicate that the direction (or from minimum or from the highest) or the bitmap of the PRB for reading.DCI format 2C is as being defined in 3GPPTS36.211.Such as, [11110011] expression effective PRB of hypothesis is from the beginning of minimum, and the most in this example, #0, #4, #8, #12, #24, #32 are assumed to be effectively in this case.

More specifically, this option is applicable to identical subframe scheduling, wherein, UE can monitor whole system bandwidth, but, once can not process the PRB more than limited quantity.In this case, due to the restriction of resource distribution, it is possible that the more PRB of PRB more manageable than UE can be scheduled.Therefore, the identical rule for ignoring too much PRB can be considered for this situation.

C () DCI public for community, if it is shared, even if then low cost MTCUE may not monitor all PRB distributed by DCI with tradition UE, it is also possible to send community public data in these PRB.

In this case, the quantity of PRB can be set equal to the quantity of the PRB distributed by DCI by UE.Then, " do not configure " or the PRB of " not supporting " (predetermined or be semi-statically configured) owing to can not be read these, so total coding speed will be far above the DCI of distribution.From the point of view of MTCUE angle, it is similar to the data being perforated (puncture) in the data being perforated (puncture) in the PRB not supported, these PRB not supported and is distributed by resource in DCI and owing to the limited hardware capabilities of UE causes not supported by UE.

Considered that low cost UE guarantees that all UE can read community public data by network.Therefore, UE assume that, even if in the case of can sending PDSCH on the PRB limited more than these, PDSCH can also be decoded by it by only reading limited PRB.In other words, public for community and/or for distributing via DCI clean culture PDSCH resource distribution is determining that TBS and other operating aspect have higher priority.

If application the method, low cost UE may need to receive data than via DCI scheduling " higher code rate ".More specifically, can be only for the public application in community the method.Or, the public PDSCH in single community is used for being different from low cost UE of tradition UE.UE assume that " PRB being only used as monitoring PRB distribution " is effective, and therefore, if DCI indicates other PRB, then UE can ignore these PRB at the quantitative aspects calculating PRB and read data.

More specifically, when receiving the DCI that system information radio network temporary identifier (SI-RNTI) is dispatched, TBS will be based on the clear and definite field in DCI format 1A (when using 1A), in this case, UE only may determine that in scheduling and is configured between effective PRB the PRB mated.When using DCI format 1C, it should determine TBS size based on DCI or PRB based on configuration.

Can be to specify which kind of mode to determine TBS in specification.Such as, if community public with tradition UE share, then only effective PRB is counted for TBS, and if community public can with tradition UE share, then for TBS at least for community public data to distribution PRB count.

Additionally, this can be limited to SI-RNTI and transmission power control RNTI (TPC-RNTI).And then, Stochastic accessing RNTI (RA-RNTI), paging RNTI (P-RNTI) can be assumed UE only to by configuring and the PRB of DCI allocative efficiency counts.

Rollback (or DCI format 1A)

If UE can be configured with one group of PRB and monitor, to avoid obscuring, then these reconfiguration message need community common used monitor subframe or for rollback operation configuration subframe/PRB in transmission.

The mode realizing this purpose is that the subset fixing PRB does not allow to change.Such as, PRB#0, #4, #8, #12, #16, #20 are configured with for unicast data monitoring PRB, UE, then, the most multiple PRB need to be fixed (such as, #0, #4, #8), and then, the PDSCH of DCI format 1A scheduling can only be scheduled in these subframes.

New set can include these fixing PRB of #0, #4, #8 so that can realize rollback operation.Under the PDSCH that fall-back mode or DCI format 1A are dispatched, UE assume that and will only be in being scheduling in these PRB (fixing PRB).

For the situation also processing that community is public and between clean culture, it is assumed that community is public and the most multiple PRB between clean culture monitoring PRB be shared make when potential fuzzy occur time network can be desirable to these PRB by data dispatch.

The use of continuous and discontinuous resource distribution

When configuring two types, UE may need to be designated at least for any type of the public use in community.Or UE can read the first public DCI in community and to assume that identical mechanism is used for remaining community public, unless otherwise configured.

Such as, if the DCI first detected uses resource allocation type 0 (continuously), then assume that it will use continuous print.Or, Class1 resource distribution (RA), UE assume that and uses discontinuous RA and then monitor the PRB via DCI scheduling.Utilizing according to local or distributed type 2, UE assumes continuously or discontinuously.

Then, start to read the next subframe of the public beginning in community.In the burst, owing to UE may monitor different PRB, so UE may not successfully detect PDSCH.Acquiescently, it is by use center 6PRB.

When UE is configured or signals which kind of type of use or during which PRB, UE will monitor these PRB (that is, be arranged in have more high priority from the implicit expression of DCI detects).

Fig. 6 is the flow chart of the operation of the UE briefly describing the invention according to the disclosure.

Signal (S610) is received on a downlink channel with reference to Fig. 6, UE.When UE is the limited MTC of receiving ability (receive cover), perform the reception of signal based on receiving ability.Such as, when UE is MTCUE, UE limited covering based on UE can receive control signal on downlink control channel (such as, ePDCCH).

UE can send signal (S620) on the uplink channel.The signal sent can be the signal corresponding with received signal.

During receiving/send signal, UE can operate as MTCUE.Such as, in the operation that signal receives, it is considered to as the ability (such as, for the narrow bandwidth of MTCUE) of MTCUE, TDM can be applied between unicast data and broadcast data.In other words, the subframe receiving unicast data and the subframe receiving broadcast data can be different.

Such as, UE can that indicated by downlink control channel, as the subframe for receiving unicast data the next subframe of subframe receive broadcast data.

Alternatively, it is contemplated that ability, a data priority during UE can give unicast data and broadcast data.Such as, when sending unicast data and broadcast data at same subframe, unicast data can be received with the priority higher than broadcast data.

As another embodiment, it is invalid to be defined as some PRB in the PRB that the UE of MTCUE can will be dispatched by DCI.Such as, when the Resource Block distributed based on control signal monitoring, the Resource Block distributed can be determined that effectively.Control signal can be received on ePDCCH.

These operations of UE according to present invention are identical with describe in detail before with other operation.

Fig. 7 is the block diagram briefly describing the wireless communication system including UE700 and BS (eNB) 740.UE700 and BS740 can be based on describing operation as explained above.

In view of downlink, the part that transmitter can be a part of BS740 and receiver can be UE700.In view of up-link, the part that transmitter can be a part of UE700 and receiver can be BS740.

Processor 710, memorizer 720 and radio frequency (RF) unit 730 can be included with reference to Fig. 7, UE700.

Processor 710 can be configured to process and/or the method for description realizing proposing in the application.Such as, processor 710 can be based on control signal monitoring control channel.

Processor 710 can consider that the ability of UE700 receives and sends signal.Such as, when UE is MTCUE, processor 710 receives broadcast data at the next subframe of the subframe indicated by downlink control channel, and the subframe indicated by downlink control channel is the subframe for receiving unicast data.Or, processor 710 can give a data priority in unicast data and broadcast data.Such as, when sending unicast data and broadcast data at same subframe, processor 710 can receive unicast data with the priority higher than broadcast data.As another embodiment, it is invalid that some PRB in the PRB that processor 710 can will be dispatched via DCI are defined as.Such as, when the Resource Block distributed based on control signal monitoring, processor 710 may determine that distributed Resource Block is effective.Control signal can be received on ePDCCH.

Memorizer 720 couples with processor 710, and stores the various information for operating processor 710, and described information includes data message and/or control information.RF unit 730 is also electrically connected to processor 710.RF unit 730 can send and/or receive wireless signal.

The details of UE700 with above with or without accompanying drawing describe identical.

BS740 can include processor 750, memorizer 760 and RF unit 770.Here, BS740 can be PCell or SCell, and BS740 can be macrocell or little community.It addition, BS could be for the cell-of-origin of Network Synchronization or for the Target cell of Network Synchronization.

Processor 750 can be configured to process and/or the method for description realizing proposing in the application.For example, it is contemplated that the UE to reception signal is MTCUE, processor 750 can repeatedly send control channel (such as, PDCCH/EPDCCH), system information, data channel (such as, PDSCH).Such as, processor 750 can apply TDM between unicast data and broadcast data.In other words, processor 750 can send unicast data, broadcast data in different subframes.Such as, processor 750 can send broadcast data at the next subframe for the subframe sending unicast data.Processor 750 can pass through the control signal labelling on downlink control channel (such as, ePDCCH) for sending the subframe of unicast data.Or, processor 750 configuration preference can be weighed between unicast data and broadcast data.Such as, when sending unicast data and broadcast data in same subframe, processor 750 can be scheduling higher than the priority of broadcast data to give unicast data.As another embodiment, processor can be for MTCUE scheduling or transmission signal so that the Resource Block distributed when the Resource Block that UE is distributed based on control signal monitoring is confirmed as effectively.Control signal can be received on ePDCCH.

Memorizer 760 couples with processor 750, and stores the various information for operating processor 750, and described information includes data message and/or control information.RF unit 770 is also electrically connected to processor 750.RF unit 770 can send and/or receive wireless signal.Also disclosed the signal sending via RF unit 770 or receiving.

UE700 and/or BS740 can have individual antenna or multiple antenna.When at least one in UE700 and BS740 has multiple antenna, wireless communication system can be referred to as mimo system.

For BS describe in more detail with above with or without accompanying drawing describe identical.

In above-mentioned example system, although using multiple step or block to describe method based on flow chart, but the invention is not restricted to the order of step, and some steps can be differently configured from remaining step and carry out according to different order.Or can carry out with remaining step simultaneously.

Additionally, embodiment described above includes the various aspects of example.Therefore, the present invention should be believed to comprise whole other replacement, the modifications and variations fallen within the scope of the appended claims.

About in description of the invention, when it is said that an element is " connected " or during " coupled " to other element, this element can be connected directly or be connected to other element, but it is to be understood that there may be third element between these two elements during.In contrast, when it is said that an element is " directly connected " or " directly coupling " arrives other element, it should be understood that the most there is not third element.

Claims (15)

1. the method being used for the radio communication of the user equipment (UE) limited via receiving ability, said method comprising the steps of:

Receive data, wherein, it is considered to the receiving ability of described UE, receive based on downlink control channel and control data；And

Signal is sent on the uplink channel based on via described downlink control channel received data.

Method the most according to claim 1, wherein, applies time division multiplex between the subframe for both downlink channel and the subframe for downlink broadcast channel.

Method the most according to claim 1, wherein, in the step receiving signal, the subframe receiving unicast data and the subframe receiving broadcast data are different.

Method the most according to claim 1, wherein, the control signal instruction on described downlink control channel receives the subframe of unicast data.

Method the most according to claim 4, wherein, receives broadcast data at the subframe different from the subframe receiving unicast data.

Method the most according to claim 1, wherein, receives broadcast data at the next subframe of the subframe indicated by described downlink control channel, and the subframe wherein indicated by described downlink control channel is the subframe for receiving unicast data.

Method the most according to claim 1, wherein, when the Resource Block distributed based on control signal monitoring, described UE determines that distributed Resource Block is effective.

Method the most according to claim 1, wherein, in the step receiving signal, when sending unicast data and broadcast data at same subframe, to receive described unicast data higher than the priority of broadcast data.

9. the radio communication device that receiving ability is limited, described radio communication device includes:

Radio frequency unit, described RF unit is used for sending and receiving wireless signal；And

Processor, described processor is operably coupled to described RF unit, and wherein, described processor is configured to send signal based on the scheduling for UL and/or DL via described RF unit,

Wherein, described processor receives control signal on the downlink control channels based on described receiving ability.

Device the most according to claim 9, wherein, the subframe receiving unicast data and the subframe receiving broadcast data are different.

11. devices according to claim 9, wherein, the described control signal instruction on described downlink control channel receives the subframe of unicast data.

12. devices according to claim 11, wherein, receive broadcast data at the subframe different from the subframe receiving unicast data.

13. devices according to claim 9, wherein, receive broadcast data at the next subframe of the subframe indicated by described downlink control channel, and the subframe wherein indicated by described downlink control channel is the subframe for receiving unicast data.

14. devices according to claim 9, wherein, when the Resource Block distributed based on the monitoring of described control signal, described processor determines that distributed Resource Block is effective.

15. devices according to claim 9, wherein, when sending unicast data and broadcast data at same subframe, described processor is to receive described unicast data higher than the priority of broadcast data via described RF unit.